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172.886 Petroleum wax.
Petroleum wax may be safely used in or on food, in accordance with the following conditions:
（a Petroleum wax is a mixture of solid hydrocarbons, paraffinic in nature, derived from petroleum, and refined to meet the specifications prescribed by this section.
（b Petroleum wax meets the following ultraviolet absorbance limits when subjected to the analytical procedure described in this paragraph.
| Maximum ultraviolet absorbance per centimeter path length | |
| 280C289 millimicrons | 0.15 |
| 290C299 millimicrons | 0.12 |
| 300C359 millimicrons | 0.08 |
| 360C400 millimicrons | 0.02 |
Analytical Specification for Petroleum Wax
general instructions
Because of the sensitivity of the test, the possibility of errors arising from contamination is great. It is of the greatest importance that all glassware be scrupulously cleaned to remove all organic matter such as oil, grease, detergent residues, etc. Examine all glassware, including stoppers and stopcocks, under ultraviolet light to detect any residual fluorescent contamination. As a precautionary measure it is recommended practice to rinse all glassware with purified isooctane immediately before use. No grease is to be used on stopcocks or joints. Great care to avoid contamination of wax samples in handling and to assure absence of any extraneous material arising from inadequate packaging is essential. Because some of the polynuclear hydrocarbons sought in this test are very susceptible to photo-oxidation, the entire procedure is to be carried out under subdued light.
apparatus
Separatory funnels. 250Cmilliliter, 500Cmilliliter, 1,000Cmilliliter, and preferably 2,000Cmilliliter capacity, equipped with tetrafluoroethylene polymer stopcocks.
Reservoir. 500Cmilliliter capacity, equipped with a 24/40 standard taper male fitting at the bottom and a suitable ball-joint at the top for connecting to the nitrogen supply. The male fitting should be equipped with glass hooks.
Chromatographic tube. 180 millimeters in length, inside diameter to be 15.7 millimeters 0.1 millimeter, equipped with a coarse, fritted-glass disc, a tetrafluoroethylene polymer stopcock, and a female 24/40 standard tapered fitting at the opposite end. （Overall length of the column with the female joint is 235 millimeters. The female fitting should be equipped with glass hooks.
Disc. Tetrafluoroethylene polymer 2Cinch diameter disc approximately3/16Cinch thick with a hole bored in the center to closely fit the stem of the chromatographic tube.
Heating jacket. Conical, for 500Cmilliliter separatory funnel. （Used with variable transformer heat control.（/p>
Suction flask. 250Cmilliliter or 500Cmilliliter filter flask.
Condenser. 24/40 joints, fitted with a drying tube, length optional.
Evaporation flask optional ? 250Cmilliliter or 500Cmilliliter capacity all-glass flask equipped with standard taper stopper having inlet and outlet tubes to permit passage of nitrogen across the surface of contained liquid to be evaporated.
Vacuum distillation assembly. All glass （for purification of dimethyl sulfoxide（ 2Cliter distillation flask with heating mantle; Vigreaux vacuum-jacketed condenser （or equivalent about 45 centimeters in length and distilling head with separable cold finger condenser. Use of tetrafluoroethylene polymer sleeves on the glass joints will prevent freezing. Do not use grease on stopcocks or joints.
Spectrophotometric cells. Fused quartz cells, optical path length in the range of 5.000 centimeters 0.005 centimeter; also for checking spectrophotometer performance only, optical path length in the range 1.000 centimeter 0.005 centimeter. With distilled water in the cells, determine any absorbance differences.
Spectrophotometer. Spectral range 250 millimicronsC400 millimicrons with spectral slit width of 2 millimicrons or less, under instrument operating conditions for these absorbance measurements, the spectrophotometer shall also meet the following performance requirements:
Absorbance repeatability, 0.01 at 0.4 absorbance.
Absorbance accuracy,1 0.05 at 0.4 absorbance.
1 As determined by using potassium chromate for reference standard and described in National Bureau of Standards Circular 484, Spectrophotometry, U.S. Department of Commerce, ?949? The accuracy is to be determined by comparison with the standard values at 290, 345, and 400 millimicrons. Circular 484 is incorporated by reference. Copies are available from the Center for Food Safety and Applied Nutrition （HFSC200? Food and Drug Administration, 5100 Paint Branch Pkwy., College Park, MD 20740, or available for inspection at the National Archives and Records Administration （NARA? For information on the availability of this material at NARA, call 202C741C6030, or go to:http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.
Wavelength repeatability, 0.2 millimicron.
Wavelength accuracy, 1.0 millimicron.
Nitrogen cylinder. Water-pumped or equivalent purity nitrogen in cylinder equipped with regulator and valve to control flow at 5 p.s.i.g.
reagents and materials
Organic solvents. All solvents used throughout the procedure shall meet the specifications and tests described in this specification. The isooctane, benzene, acetone, and methyl alcohol designated in the list following this paragraph shall pass the following test:
To the specified quantity of solvent in a 250Cmilliliter Erlenmeyer flask, add 1 milliliter of purified n- hexadecane and evaporate on the steam bath under a stream of nitrogen （a loose aluminum foil jacket around the flask will speed evaporation? Discontinue evaporation when not over 1 milliliter of residue remains. （To the residue from benzene add a 10Cmilliliter portion of purified isooctane, reevaporate, and repeat once to insure complete removal of benzene.（/p>
Alternatively, the evaporation time can be reduced by using the optional evaporation flask. In this case the solvent and n- hexadecane are placed in the flask on the steam bath, the tube assembly is inserted, and a stream of nitrogen is fed through the inlet tube while the outlet tube is connected to a solvent trap and vacuum line in such a way as to prevent any flow-back of condensate into the flask.
Dissolve the 1 milliliter of hexadecane residue in isooctane and make to 25 milliliters volume. Determine the absorbance in the 5Ccentimeter path length cells compared to isooctane as reference. The absorbance of the solution of the solvent residue （except for methyl alcohol shall not exceed 0.01 per centimeter path length between 280 and 400 m For methyl alcohol this absorbance value shall be 0.00.
Isooctane 2,2,4Ctrimethylpentane ? Use 180 milliliters for the test described in the preceding paragraph. Purify, if necessary, by passage through a column of activated silica gel （Grade 12, Davison Chemical Company, Baltimore, Maryland, or equivalent about 90 centimeters in length and 5 centimeters to 8 centimeters in diameter.
Benzene, A.C.S. reagent grade. Use 150 milliliters for the test. Purify, if necessary, by distillation or otherwise.
Acetone, A.C.S. reagent grade. Use 200 milliliters for the test. Purify, if necessary, by distillation.
Eluting mixtures:
1. 10 percent benzene in isooctane. Pipet 50 milliliters of benzene into a 500Cmilliliter glass-stoppered volumetric flask and adjust to volume with isooctane, with mixing.
2. 20 percent benzene in isooctane. Pipet 50 milliliters of benzene into a 250Cmilliliter glass-stoppered volumetric flask, and adjust to volume with isooctane, with mixing.
3. Acetone-benzene-water mixture. Add 20 milliliters of water to 380 milliliters of acetone and 200 milliliters of benzene, and mix.
n-Hexadecane, 99 percent olefin-free. Dilute 1.0 milliliter of n- hexadecane to 25 milliliters with isooctane and determine the absorbance in a 5Ccentimeter cell compared to isooctane as reference point between 280 m̨C400 m The absorbance per centimeter path length shall not exceed 0.00 in this range. Purify, if necessary, by percolation through activated silica gel or by distillation.
Methyl alcohol, A.C.S. reagent grade. Use 10.0 milliliters of methyl alcohol. Purify, if necessary, by distillation.
Dimethyl sulfoxide. Pure grade, clear, water-white, m.p. 18 minimum. Dilute 120 milliliters of dimethyl sulfoxide with 240 milliliters of distilled water in a 500Cmilliliter separatory funnel, mix and allow to cool for 5C10 minutes. Add 40 milliliters of isooctane to the solution and extract by shaking the funnel vigorously for 2 minutes. Draw off the lower aqueous layer into a second 500Cmilliliter separatory funnel and repeat the extraction with 40 milliliters of isooctane. Draw off and discard the aqueous layer. Wash each of the 40Cmilliliter extractives three times with 50Cmilliliter portions of distilled water. Shaking time for each wash is 1 minute. Discard the aqueous layers. Filter the first extractive through anhydrous sodium sulfate prewashed with isooctane （see Sodium sulfate under Reagents and Materials for preparation of filter? into a 250Cmilliliter Erlenmeyer flask, or optionally into the evaporating flask. Wash the first separatory funnel with the second 40Cmilliliter isooctane extractive, and pass through the sodium sulfate into the flask. Then wash the second and first separatory funnels successively with a 10Cmilliliter portion of isooctane, and pass the solvent through the sodium sulfate into the flask. Add 1 milliliter of n- hexadecane and evaporate the isooctane on the steam bath under nitrogen. Discontinue evaporation when not over 1 milliliter of residue remains. To the residue, add a 10Cmilliliter portion of isooctane and reevaporate to 1 milliliter of hexadecane. Again, add 10 milliliters of isooctane to the residue and evaporate to 1 milliliter of hexadecane to insure complete removal of all volatile materials. Dissolve the 1 milliliter of hexadecane in isooctane and make to 25Cmilliliter volume. Determine the reference. The absorbance of the solution should not exceed 0.02 per centimeter path length in the 280 m̨C400 m range. （Note.Difficulty in meeting this absorbance specification may be due to organic impurities in the distilled water. Repetition of the test omitting the dimethyl sulfoxide will disclose their presence. If necessary to meet the specification, purify the water by redistillation, passage through an ion-exchange resin, or otherwise.（/p>
Purify, if necessary, by the following procedure: To 1,500 milliliters of dimethyl sulfoxide in a 2Cliter glass-stoppered flask, add 6.0 milliliters of phosphoric acid and 50 grams of Norit A （decolorizing carbon, alkaline or equivalent. Stopper the flask, and with the use of a magnetic stirrer （tetrafluoroethylene polymer coated bar stir the solvent for 15 minutes. Filter the dimethyl sulfoxide through four thicknesses of fluted paper ?8.5 centimeters, Schleicher & Schuell, No. 597, or equivalent? If the initial filtrate contains carbon fines, refilter through the same filter until a clear filtrate is obtained. Protect the sulfoxide from air and moisture during this operation by covering the solvent in the funnel and collection flask with a layer of isooctane. Transfer the filtrate to a 2Cliter separatory funnel and draw off the dimethyl sulfoxide into the 2Cliter distillation flask of the vacuum distillation assembly and distill at approximately 3Cmillimeter Hg pressure or less. Discard the first 200Cmilliliter fraction of the distillate and replace the distillate collection flask with a clean one. Continue the distillation until approximately 1 liter of the sulfoxide has been collected.
At completion of the distillation, the reagent should be stored in glass-stoppered bottles since it is very hygroscopic and will react with some metal containers in the presence of air.
Phosphoric acid. 85 percent A.C.S. reagent grade.
Sodium borohydride. 98 percent.
Magnesium oxide Sea Sorb 43, Food Machinery Company, Westvaco Division, distributed by chemical supply firms, or equivalent ? Place 100 grams of the magnesium oxide in a large beaker, add 700 milliliters of distilled water to make a thin slurry, and heat on a steam bath for 30 minutes with intermittent stirring. Stir well initially to insure that all the absorbent is completely wetted. Using a Buchner funnel and a filter paper （Schleicher & Schuell No. 597, or equivalent of suitable diameter, filter with suction. Continue suction until water no longer drips from the funnel. Transfer the absorbent to a glass trough lined with aluminum foil （free from rolling oil? Break up the magnesia with a clean spatula and spread out the absorbent on the aluminum foil in a layer about 1 centimeter to 2 centimeters thick. Dry for 24 hours at 160 C 1 C. Pulverize the magnesia with mortar and pestle. Sieve the pulverized absorbent between 60C180 mesh. Use the magnesia retained on the 180Cmesh sieve.
Celite 545. Johns-Manville Company, diatomaceous earth, or equivalent.
Magnesium oxide-Celite 545 mixture 2 + 1 by weight. Place the magnesium oxide ?0C180 mesh and the Celite 545 in 2 to 1 proportions, respectively, by weight in a glass-stoppered flask large enough for adequate mixing. Shake vigorously for 10 minutes. Transfer the mixture to a glass trough lined with aluminum foil （free from rolling oil and spread it out on a layer about 1 centimeter to 2 centimeters thick. Reheat the mixture at 160 C 1 C for 2 hours, and store in a tightly closed flask.
Sodium sulfate, anhydrous, A.C.S. reagent grade, preferably in granular form. For each bottle of sodium sulfate reagent used, establish as follows the necessary sodium sulfate prewash to provide such filters required in the method: Place approximately 35 grams of anhydrous sodium sulfate in a 30Cmilliliter coarse, fritted-glass funnel or in a 65Cmillimeter filter funnel with glass wool plug; wash with successive 15Cmilliliter portions of the indicated solvent until a 15Cmilliliter portion of the wash shows 0.00 absorbance per centimeter path length between 280 m and 400 m when tested as prescribed under Organic solvents. Usually three portions of wash solvent are sufficient.
Before proceeding with analysis of a sample, determine the absorbance in a 5Ccentimeter path cell between 250 m and 400 m for the reagent blank by carrying out the procedure, without a wax sample, at room temperature, recording the spectra after the extraction stage and after the complete procedure as prescribed. The absorbance per centimeter path length following the extraction stage should not exceed 0.040 in the wavelength range from 280 m to 400 m the absorbance per centimeter path length following the complete procedure should not exceed 0.070 in the wavelength range from 280 m to 299 m inclusive, nor 0.045 in the wavelength range from 300 m to 400 m If in either spectrum the characteristic benzene peaks in the 250 m̨C260 m region are present, remove the benzene by the procedure under Organic solvents and record absorbance again.
Place 300 milliliters of dimethyl sulfoxide in a 1Cliter separatory funnel and add 75 milliliters of phosphoric acid. Mix the contents of the funnel and allow to stand for 10 minutes. （The reaction between the sulfoxide and the acid is exothermic. Release pressure after mixing, then keep funnel stoppered. Add 150 milliliters of isooctane and shake to preequilibrate the solvents. Draw off the individual layers and store in glass-stoppered flasks.
Place a representative 1Ckilogram sample of wax, or if this amount is not available, the entire sample, in a beaker of a capacity about three times the volume of the sample and heat with occasional stirring on a steam bath until the wax is completely melted and homogeneous. Weigh four 25Cgram 0.2 gram portions of the melted wax in separate 100Cmilliliter beakers. Reserve three of the portions for later replicate analyses as necessary. Pour one weighed portion immediately after remelting （on the steam bath into a 500Cmilliliter separatory funnel containing 100 milliliters of the preequilibrated sulfoxide-phosphoric acid mixture that has been heated in the heating jacket at a temperature just high enough to keep the wax melted. （Note:In preheating the sulfoxide-acid mixture, remove the stopper of the separatory funnel at intervals to release the pressure.（/p>
Promptly complete the transfer of the sample to the funnel in the jacket with portions of the preequilibrated isooctane, warming the beaker, if necessary, and using a total volume of just 50 milliliters of the solvent. If the wax comes out of solution during these operations, let the stoppered funnel remain in the jacket until the wax redissolves. （Remove stopper from the funnel at intervals to release pressure. When the wax is in solution, remove the funnel from the jacket and shake it vigorously for 2 minutes. Set up three 250Cmilliliter separatory funnels with each containing 30 milliliters of preequilibrated isooctane. After separation of the liquid phases, allow to cool until the main portion of the wax-isooctane solution begins to show a precipitate. Gently swirl the funnel when precipitation first occurs on the inside surface of the funnel to accelerate this process. Carefully draw off the lower layer, filter it slowly through a thin layer of glass wool fitted loosely in a filter funnel into the first 250Cmilliliter separatory funnel, and wash in tandem with the 30Cmilliliter portions of isooctane contained in the 250Cmilliliter separatory funnels. Shaking time for each wash is 1 minute. Repeat the extraction operation with two additional portions of the sulfoxide-acid mixture, replacing the funnel in the jacket after each extraction to keep the wax in solution and washing each extractive in tandem through the same three portions of isooctane.
Collect the successive extractives ?00 milliliters total in a separatory funnel （preferably 2Cliter? containing 480 milliliters of distilled water, mix, and allow to cool for a few minutes after the last extractive has been added. Add 80 milliliters of isooctane to the solution and extract by shaking the funnel vigorously for 2 minutes. Draw off the lower aqueous layer into a second separatory funnel （preferably 2Cliter and repeat the extraction with 80 milliliters of isooctane. Draw off and discard the aqueous layer. Wash each of the 80Cmilliliter extractives three times with 100Cmilliliter portions of distilled water. Shaking time for each wash is 1 minute. Discard the aqueous layers. Filter the first extractive through anhydrous sodium sulfate prewashed with isooctane （see Sodium Sulfate under Reagents and Materials for preparation of filter into a 250Cmilliliter Erlenmeyer flask （or optionally into the evaporation flask? Wash the first separatory funnel with the second 80Cmilliliter isooctane extractive and pass through the sodium sulfate. Then wash the second and first separatory funnels successively with a 20Cmilliliter portion of isooctane and pass the solvent through the sodium sulfate into the flask. Add 1 milliliter of n- hexadecane and evaporate the isooctane on the steam bath under nitrogen. Discontinue evaporation when not over 1 milliliter of residue remains. To the residue, add a 10Cmilliliter portion of isooctane, reevaporate to 1 milliliter of hexadecane, and repeat this operation once.
Quantitatively transfer the residue with isooctane to a 25Cmilliliter volumetric flask, make to volume, and mix. Determine the absorbance of the solution in the 5Ccentimeter path length cells compared to isooctane as reference between 280 m̨C400 m （take care to lose none of the solution in filling the sample cell? Correct the absorbance values for any absorbance derived from reagents as determined by carrying out the procedure without a wax sample. If the corrected absorbance does not exceed the limits prescribed in this paragraph （b? the wax meets the ultraviolet absorbance specifications. If the corrected absorbance per centimeter path length exceeds the limits prescribed in this paragraph （b? proceed as follows:
Quantitatively transfer the isooctane solution to a 125Cmilliliter flask equipped with 24/40 joint and evaporate the isooctane on the steam bath under a stream of nitrogen to a volume of 1 milliliter of hexadecane. Add 10 milliliters of methyl alcohol and approximately 0.3 gram of sodium borohydride. （Minimize exposure of the borohydride to the atmosphere. A measuring dipper may be used. Immediately fit a water-cooled condenser equipped with a 24/40 joint and with a drying tube into the flask, mix until the borohydride is dissolved, and allow to stand for 30 minutes at room temperature, with intermittent swirling. At the end of this period, disconnect the flask and evaporate the methyl alcohol on the steam bath under nitrogen until the sodium borohydride begins to come out of the solution. Then add 10 milliliters of isooctane and evaporate to a volume of about 2C3 milliliters. Again, add 10 milliliters of isooctane and concentrate to a volume of approximately 5 milliliters. Swirl the flask repeatedly to assure adequate washing of the sodium borohydride residues.
Fit the tetrafluoroethylene polymer disc on the upper part of the stem of the chromatographic tube, then place the tube with the disc on the suction flask and apply the vacuum （approximately 135 millimeters Hg pressure? Weight out 14 grams of the 2:1 magnesium oxide-Celite 545 mixture and pour the adsorbent mixture into the chromatographic tube in approximately 3Ccentimeter layers. After the addition of each layer, level off the top of the adsorbent with a flat glass rod or metal plunger by pressing down firmly until the adsorbent is well packed. Loosen the topmost few millimeters of each adsorbent layer with the end of a metal rod before the addition of the next layer. Continue packing in this manner until all the 14 grams of the adsorbent is added to the tube. Level off the top of the adsorbent by pressing down firmly with a flat glass rod or metal plunger to make the depth of the adsorbent bed approximately 12.5 centimeters in depth. Turn off the vacuum and remove the suction flask. Fit the 500Cmilliliter reservoir onto the top of the chromatographic column and prewet the column by passing 100 milliliters of isooctane through the column. Adjust the nitrogen pressure so that the rate of descent of the isooctane coming off of the column is between 2C3 milliliters per minute. Discontinue pressure just before the last of the isooctane reaches the level of the adsorbent. （Caution:Do not allow the liquid level to recede below the adsorbent level at any time. Remove the reservoir and decant the 5Cmilliliter isooctane concentrate solution onto the column and with slight pressure again allow the liquid level to recede to barely above the adsorbent level. Rapidly complete the transfer similarly with two 5Cmilliliter portions of isooctane, swirling the flask repeatedly each time to assure adequate washing of the residue. Just before the final 5Cmilliliter wash reaches the top of the adsorbent, add 100 milliliters of isooctane to the reservoir and continue the percolation at the 2C3 milliliter per minute rate. Just before the last of the isooctane reaches the adsorbent level, add 100 milliliters of 10 percent benzene in isooctane to the reservoir and continue the percolation at the aforementioned rate. Just before the solvent mixture reaches adsorbent level, add 25 milliliters of 20 percent benzene in isooctane to the reservoir and continue the percolation at 2C3 milliliters per minute until all this solvent mixture has been removed from the column. Discard all the elution solvents collected up to this point. Add 300 milliliters of the acetone-benzene-water mixture to the reservoir and percolate through the column to elute the polynuclear compounds. Collect the eluate in a clean 1Cliter separatory funnel. Allow the column to drain until most of the solvent mixture is removed. Wash the eluate three times with 300Cmilliliter portions of distilled water, shaking well for each wash. （The addition of small amounts of sodium chloride facilitates separation. Discard the aqueous layer after each wash. After the final separation, filter the residual benzene through anhydrous sodium sulfate prewashed with benzene （see Sodium sulfate under Reagents and Materials for preparation of filter into a 250Cmilliliter Erlenmeyer flask （or optionally into the evaporation flask? Wash the separatory funnel with two additional 20Cmilliliter portions of benzene which are also filtered through the sodium sulfate. Add 1 milliliter of n- hexadecane and completely remove the benzene by evaporation under nitrogen, using the special procedure to eliminate benzene as previously described under Organic Solvents. Quantitatively transfer the residue with isooctane to a 25Cmilliliter volumetric flask and adjust to volume. Determine the absorbance of the solution in the 5Ccentimeter path length cells compared to isooctane as reference between 250 m̨C400 m Correct for any absorbance derived from the reagents as determined by carrying out the procedure without a wax sample. If either spectrum shows the characteristic benzene peaks in the 250 m̨C260 m region, evaporate the solution to remove benzene by the procedure under Organic Solvents. Dissolve the residue, transfer quantitatively, and adjust to volume in isooctane in a 25Cmilliliter volumetric flask. Record the absorbance again. If the corrected absorbance does not exceed the limits prescribed in this paragraph （b? the wax meets the ultraviolet absorbance specifications.
（c Petroleum wax may contain one or more of the following adjuvants in amounts not greater than that required to produce their intended effect:
? Antioxidants permitted in food by regulations issued in accordance with section 409 of the act.
? Poly（alkylacrylate （CAS Reg. No. 27029C57C8? made from long chain （C16-C22 alcohols and acrylic acid, or poly（alkylmethacrylate （CAS Reg. No. 179529C36C3? made from long chain （C18-C22 methacrylate esters, having:
（i A number average molecular weight between 40,000 and 100,000;
（ii A weight average molecular weight （MWw to number average molecular weight （MWn ratio （MWw/MWn of not less than 3; and
（iii Unreacted alkylacrylate or alkylmethacrylate monomer content not in excess of 14 percent, as determined by a method entitled Method for Determining Weight-Average and Number-Average Molecular Weight and for Determining Alkylacrylate Monomer Content of Poly（alkylacrylate used as Processing Aid in Manufacture of Petroleum Wax, which is incorporated by reference in accordance with 5 U.S.C. 552（a and 1 CFR part 51. Copies are available from the Office of Premarket Approval （HFSC200? Center for Food Safety and Applied Nutrition, Food and Drug Administration, 5100 Paint Branch Pkwy., College Park, MD 20740, or may be examined at the Center for Food Safety and Applied Nutrition's Library, Food and Drug Administration, 5100 Paint Branch Pkwy., College Park, MD 20740 or at the National Archives and Records Administration （NARA? For information on the availability of this material at NARA, call 202C741C6030, or go to:http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html. Petroleum wax shall contain not more than 1,050 parts per million of poly（alkylacrylate or poly（alkylmethacrylate residues as determined by a method entitled Method for Determining Residual Level of Poly（alkylacrylate in Petroleum Wax, which is incorporated by reference. Copies are available from the addresses cited in this paragraph.
（d Petroleum wax is used or intended for use as follows:
| Use | Limitations |
| In chewing gum base, as a masticatory substance | In an amount not to exceed good manufacturing practice. |
| On cheese and raw fruits and vegetables as a protective coating | In an amount not to exceed good manufacturing practice. |
| As a defoamer in food | In accordance with 173.340 of this chapter. |
| As a component of microcapsules for spice-flavoring substances | In accordance with 172.230 of this chapter. |
[42 FR 14491, Mar. 15, 1977, as amended at 45 FR 48123, July 18, 1980; 47 FR 11838, Mar. 19, 1982; 50 FR 32561, Aug. 13, 1985; 51 FR 19544, May 30, 1986; 54 FR 24897, June 12, 1989; 64 FR 44122, Aug. 13, 1999]
更多关于美国 FDA 已批准的直接用于人类食品的添加剂种类法规，请点击 美国FDA 21 CFR ?72部分已批准的直接用于人类食品的添加剂种类汇怺/a>
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